Primer valve



PRIMER VALVE 4Filed March 6, 1935 'www A TTO/PNE Y Patented Aug. 21,1934 OFF ICE 1,970,744 f y PRIMER VALVE' n Philip S. Goss, Portland,'0reg. Application March 6,1933,v` serial No. 659,605

` 4 claiis. (o1. isz-12)` My invention relates to devices whereby anintermittent supply of water is furnished in small quantities to a trapsuch as the trap of a noor drain or other infrequently used iixture topre- 5 vent evaporation from breaking the sealof the, trap andtheadvantages of the invention reside` inthe construction and combinationof the parts of which it is composed.

One of the objects of my invention is to provide an appliance of thecharacter indicated that will meter an unfailing small amount of waterto a trap without wasting it and without being subjected to thedisadvantage ordinarily accompanying a small metering opening thatfrequently not waste water.

Another object of my invention is to provide a device of the characterdescribed wherein an ain gapl is placed in the waste pipe to effectuallyprefY These and other objects of the invention will ber fully explainedin this specification and particu-y larly pointed out inthe claims. 1

A drawing accompanies and forms apart of this specification in which,-

Fig. I is a longitudinal section of my primer Valve showing the positionof the various parts when it is in full service and operating;

Fig. II is a yview of the same structure ina state f rest; Y

Both Views are sectioned in part and uniformly, to clearly delineate itsconstruction;

Fig. III is a View of the plunger P removed from the body of the valve;and

Fig. IV is a projection of Fig. III.

A body, 1, is provided with a central bore, 2, which should be reamedand iinished smoothly on the inside. The top of the body, 3, is prei-215 erably closed and made integral with l. At the lower end a closure,4, is provided threaded at and provided with a seat, 6, upon which isplaced a gasket, 7, of any suitable material which upon threading thetwo parts together will be compressed to form a watertight joint betweenthat portion of the body indicated by la and the seat, 6. Mounted withinthe body, 1, is the plunger, P, which carries three bosses indicated byP1, P2 and P3. The iirst two of the bosses, P1 and P2, 55Y will be afairly close iit in the central bore, 2,

closes entirely if made small enough so that it will though as is wellknown itis not possible to make such-a t soi that it will be fluid tightand remain so and neither in this case is it expedient to do this..i .YHowever the t should be such that any tendency to liquid iiow from theinlet, I, towardv the outlet, O, will influence the boss P2. The boss P3is fitted more loosely within the central bore, 2;.so that fluids canpass freely between its perimeter and the bore 2. A spring, S, is placedin the top of the eentraibore, 2, so that a slight in1ua1'65'-compression is had when the parts are in position as shown in Fig. IIand this spring is made light enough so that only a few ounces ofpressure are exerted against the boss P1. when the parts are in positionas-shown inFigaI. i

Imbedded i in the lower 4part of the boss P3 isa valve gasket, V, beingfirmly held in place by thenut, N, mounted on the stem, 8, which isthreadedat its lupperV end into the boss P3 as indicated at 9.v `.On theJ interior surface of the closure, 4, is a raised valve seat, 10,withinwhich is a pocket, r1l, to accommodate the nut N. The stemlS asshown vextends a considerable distance below thenut N and extends at`all times through the pocketfll and through an inserted bushing., 12,and is of such further length that even when the valve is wide open, asshown in Fig. I, it will 'extend'well pastthe top of the air gap, 13,and the reason. for this is hereinafter explained. It will be noted thatthe inserted bushingyiz, is made slightly larger in internal diameterthan the stern 8.as shown at 12a.

This valve willcustomarily be installed in a' supply line to afrequently used fixture such as a kitchen sink and the inlet I will beconnected'to 90 a source of vwater supply under pressure and the outletO will be a continuation of this water supply toward the fixture; it maybe a kitchen sink as indicated. When no Water is being used at the xturea balanced pressure will exist throughout the priming valve except thatthere will be a hydrostatic tendency to keep the plunger P downward andthe valve V in contact with the seat ring, 10, due to the dierence inarea between the seat ring, 10, and the bosses, Pl and P2. Thishydrostatic pressure will be in addition to the slight pressure imposedby the spring S.

As soon as a faucet is opened and water starts to flow from I toward O,the reduction in pressure on the O side of the iixture will causepressure under P2 and Pl and that part of P3 without the seat ring 10 toraise the whole internal structure toward the position shown in Fig. Iof the drawing; whereupon, a comparatively free passageway for waterfrom I toward O will be 41V- tively strong spring must be used toprevent con,

established and the valve V will be raised off of the seat ring 10 andfluid at full pressure will tend to flow through the metering opening12a, that is the annular space between the stem 8 and the inside of thebushing 12. This annular space or opening will ordinarily be only a fewthousandths of an inch, say five thousandths of an inch if the stem 8 ismade one-eighth of an inch in diameter, which is suggested as a gooddimension. A thin' small stream Ofwater will then nd its way through 12aand will hug the lower end of the stem 8, having its velocity reduced tothat induced by gravity and will drop ofi?)- the lower end of the stem 8Without splashing outwardly through the air gap 13 or indeed moisteningthe inside of the passageway adjacent the air gap. This lack ofsplashing and moistening tends to cleanliness since dust will not stickif the surfaces are dry to such an extent that it will if they are damp.

The Stem 8 should be made of noncorrosive metal, nickel iron alloys aresuggestedand brass and copper ordinarily willnot sufce. The bushing 12should also be'made of a `similar metal for the reason that practicallyall domestic water supplies nowadays carry some vegetable acids and asmall portion of chlorine and where ex. posed Ato atmospheric oxygen, asthese parts are for the greater portion of the time, theyv will corrodeand if left for any considerable time corrosion will cause the valve tostick.

By making the valve as I have made it with a seat rim completelyindependent from the open., ing or metering device, I have overcome avery serious diiculty; for if the metering opening is made small enoughto limitthe flow to what will flow under a given pressure throughtheanf-v nular opening 12a. then any slight scale or sub.

stance found in the water will close it altogether and the purpose ofinstallingthe valve will be defeated. If a small metering opening is provided with a valve that closes Vit directly, Very.

small pressure differential t0 keep the valve closed hydrosatically canbe available and a compara tinual leakage and such a spring tends tointere. fere with water supply to the master fixture. will be noted thatthe instant the master fixture starts to use water the pressuredifferential is reversed.

failing amount ofy water and a dangerous menace' to public health willbe removed. This menace is so Well appreciated that in a large number offirst class cities cellar Hoor drains are not permitted to be connectedto the sewer system.

Having thus fully described my invention, the manner of its use and theadvantages due to its use, what I claim as new and desire to secure byLetters Patent, is:

1. A priming valve for a trap defined in part as a body member having abore therein, a plunger in said bore that is movable under the influenceof liquid flow therethrough, a valve 4member carried by said plunger, aco-operating valve seat for said valve, a metering discharge outletvbeyond and spaced from said valve and seat, a stem projecting throughsaid metering outlet that. is attached to the valve and movabletherewith vto prevent clogging of said metering outlet, a passagewaybelow said metering outlet, and air gaps in said passageway, the saidstem being arranged to direct flow from said metering outlet pastsaidair gap.

2. In a metering outlet for a priming valve,v a tube, a stern in saidtube to restrict its area, to.

an annular space between the stem andthe in, side of the tube, and ahydraulically operated valve to control the iiow through the meteringoutlet that is spaced therefrom', vthe said'stem being attached to saidvalve and movable therewith to prevent clogging of said metering 0utlet.

3, In a priming valve, a bore therein that forms a part of a conduitfrom a source of Water supply under pressure to a water consuminglixture, a, branch outlet from said bore to supplyy Water to a trap,a'valve controlling the branch' outlet, hydraulic means for controllingsaid Valve t0 open said valve under the influence of i'low projectingthrough said` metering openingv and* past said air gap.

4.' A priming valve for a trap denedvas albo'dy having a passagewaytherethrough that is part ofl a conduit from a source of water supplyunder pressure to a water consuming xture, a hydraulically operatedplunger inv said'passageway movable under influence of flow toward said'I ix-A ture, a valve member attached to said plunger that controls iiowto a trap, a gio-operating sea-t for said valve, a metering outletspaced beyond' said seat, a stem attached to said valve that projectsthrough said metering outlet to restrict its area to an annular spacebetween the inside of the outlet and the stem, said stem being mov? ablewith said valve to prevent clogging of said metering outlet.

PHILIP S. GOSS;

